Add: Query coalescing for AND clauses

A later commit will update and add tests.

org-ql.info

@@ -1015,6 +1015,10 @@ File: README.info,  Node: 07-pre,  Next: 062,  Up: Changelog
    *Changed*
    • Give more useful error message for invalid queries.
 
+   *Internal*
+   • Certain query predicates, when called multiple times in an ‘and’
+     sub-expression, are optimized to a single call.
+
 
 File: README.info,  Node: 062,  Next: 061,  Prev: 07-pre,  Up: Changelog
 
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